<template>
  <div>
    <!-- 行内表单
        inline：代表行内表单
    -->
    <el-form :inline="true" class="demo-form-inline" :model="cForm">
        <el-form-item label="一级分类">
            <el-select placeholder="请选择" v-model="cForm.category1Id" @change="handler1" :disabled="cannotshow">
                <el-option :label="c1.name" :value="c1.id" v-for="(c1,index) in list1" :key="c1.id"></el-option>
            </el-select>
        </el-form-item>
        <el-form-item label="二级分类">
            <el-select placeholder="请选择" v-model="cForm.category2Id" @change="handler2" :disabled="cannotshow">
                <el-option :label="c2.name" :value="c2.id" v-for="(c2,index) in list2" :key="c2.id"></el-option>
            </el-select>
        </el-form-item>
        <el-form-item label="三级分类">
            <el-select placeholder="请选择" v-model="cForm.category3Id" @change="handler3" :disabled="cannotshow">
                <el-option :label="c3.name" :value="c3.id" v-for="(c3,index) in list3" :key="c3.id"></el-option>
            </el-select>
        </el-form-item>
    </el-form>
  </div>
</template>

<script>
export default {
    name:'CategorySelect',
    props:['cannotshow'],
    data() {
        return {
            list1:[], //一级分类数据
            list2:[], //二级分类数据
            list3:[], //三级分类数据
            // 收集一级二级三级分类的id
            cForm:{
                category1Id:'',
                category2Id:'',
                category3Id:'',
            }
        }
    },
    // 组件一挂载就应该获取一级数据
    mounted() {
        this.getCategory1List();
    },
    methods: {
        // 获取一级分类数据的方法
        async getCategory1List(){
            let result = await this.$API.attr.reqCategory1List();
            if(result.code==200){
                this.list1 = result.data;
            }
        },
        // 一级分类的select事件回调（获取二级分类数据）
        async handler1(){
            // 清除二级三级分类数据
            this.list2 = [];
            this.list3 = [];
            this.cForm.category2Id = '';
            this.cForm.category3Id = '';
            // 解构出一级分类id
            const {category1Id} = this.cForm;
            this.$emit('getCategoryId',{categoryId:category1Id,level:1});
            // 获取二级分类数据
            let result = await this.$API.attr.reqCategory2List(category1Id);
            if(result.code==200){
                this.list2 = result.data;
            }
        },
        // 二级分类的select事件回调（获取三级分类数据）
        async handler2(){
            // 清除三级分类数据
            this.list3 = [];
            this.cForm.category3Id = '';
            // 解构出二级分类id
            const {category2Id} = this.cForm;
            this.$emit('getCategoryId',{categoryId:category2Id,level:2});
            // 获取二级分类数据
            let result = await this.$API.attr.reqCategory3List(category2Id);
            if(result.code==200){
                this.list3 = result.data;
            }
        },
        // 三级分类事件的=回调
        handler3(){
            const {category1Id,category2Id,category3Id} = this.cForm;
            // 将id传递给父组件
            this.$emit('getCategoryId',{categoryId:category3Id,level:3});
        }
    },
}
</script>

<style>

</style>